Process for the production of printing-blocks of slight weight.



S. A. C. KRISTENSEN.

PROCESS FOR THE PRODUCTION-0F PRINTING BLOCKS 0F SLIGHT WEIGHT.

APPLICATION FILED FEB.27,1914.

1,166,840, Patented Jan. 4,1916.

% w /4/// M A /g 6 11/ Q! W W INVENTOR SIGVALD A.C. KRISTEN sew.

ATTORNEYS.

' n the accompanying drawing, one way of .-facing the matrix,

srevm ALFRED cnnxs'ri'an xmsrnnsnn', or cornnnnenn, nmmaax.

:enocnss FOR THE Pnonuc'non or PRINTING-monies or smear waien'r,

To all whom it may concern a Be. it. known that I, SIGVALD ALFRED CHRISTIAN Kms'rnxsnis, a subject of the. King of Denmark residing at .11 Abel Kath-' rinesgade, Copenhagen, Denmark, have'invented new and useful Improvements in Processes for the Production of Printing- Blocks of Slight Weight, of which-the following is aspecification.

The shipment of printing blocks is rather troublesome on account of their weight and; especially in case of blocks for pictures in the daily papers, etc., this is felt as a. great inconvenience.

The object of the present invention is to .produce printing blocks of but slight weight.

A matrix, 71. e. 'a negative cast of type,' blocks, etc., is first made of a material suitable for this purpose, z. e. a substance which is waterproof, able tostand a certain amountof heat and acer ain, quite considerable pressure without being damaged, and thematrix is now treated in-the ordinary man-' ner bybeing rubbed with oil. Then a flong of unsized paper (blotting paper) is coated with a mass consisting v of metal powder stirred up in an eiiicient adhesive, for instance water-glass, until the paper is covered. a uniform coating. As soon as a film. has been formed, by drying, onthe surface of the mass thus superimposed, the paper isplaced on top of the matrix, with this layer then it is tapped into all its cavities by means of a'brush and, finally, the entire thin is broughtinto a hot drying press. A ter being dried, 'the paper the metallic coating adhering thereto is removed, and, if necessary, the iiregu arities on the rearside of this flong are filled with aisuitable substance, for in.-

4 stance laster of Paris and celluloid. After plate thus this filing substance has been dried, the produced may be placed on a wooden base, afid a block ready to be printed has then at once been. produced, it being an exact reprodu tion of the original type form, blocks, etc.',' and being-hard and (3111? eeived an impression able enough to stand a very large number of impigelssilgns, exactly as a stereotyped printoc a carrying out the-process isiillustrated. .In Flgure 1, a is the form,-such for instance as an etching, to be reproduced, and b, a lead plate to he used as a matrix before it has re,

is applied immediately thereafter on; the 10 f ess is, at the said blocks with a paste side between them from the for1n.- Fig.

Specification of Letters Patent. 0 Jan. 4,-

Application filed February 27,1614. Serial 1%. 821,5 p a a,

.2 shows the (1 provided with acoating e. Fig. 3 shows the final printing plate. of light the flong d and'the'fio hardened and impressed coating 6. 1

Instead of applylngithe metallic mass on the paper flong it may be applied,- by 7 means of a-soft brush, directly onth'e matrix, fi I p ne .,65

and

only when the layer is dry a piece of 'linen cloth; or'tissue paper coated with the;

mass is placed on. top and tapped'ginto all jofcani rear side and is exposed to a slight-press'ure, until itis dry. In this case,"thee-idry.

ing should be effected without heat.

For, the production of the matrix the basis for this"process,-- or celluloid will be very suitable lead is sed, -the printing form ispressed thereaga inst at there are here, live-etchings, wood-cuts er the; like; no depressions on. the rear side "oftfthe fblo'ck'. formed, there is rial.

forming j for instancelead 1 a pressure'sufliciently heavy y to stamp the form completely into-the lead,

When making casts of autoty-pes, the proc.- Q beginning, the same, but/as l in opposition to"type-forms,'.

no use-for any filling mate. 5., 7 Instead of this, the smooth r-earsideg is w With "an adhejsivesubstance, in

order that theimpression'may beplaced-on a smooth surface cast. inordinary stereo}.

type plates or,

as the ease j may be, onfiat cast plates or on cylindrical cast plates: for? printing in a -rotarypress.=v v v 1 Having now v.pa'uticularl'y -.deserib'ed and ascertained the nature of'my said invention and'in what manner the same is to he per-{ formed, I declare that whatIf claim"is:

1. Process for the production of'printing platesof insignificant weightlby the use. at? an auxiliary block; 'saidfprocess consisting'l negative by pressing said auxilary block of the. following steps: first, producing a against the form to be reproduced; second, providing a second 'blockinfthe form of a flong of unsized paper; third, coating one'of and water-glass; blocks against each other with the coated 2. Process the product'on of, printing of metallic powder 1 'four'th, pressing the two fifth, drying. the blocks 11( Q mo em plates of insignificant Weight by the use of ary block; fifth, drying the blocks in a hot an auxiliary block;. said rocess consisting drying press; and sixth, removing the secof the following steps: rst, producing a and b ock with the adhering coating, which negative by pressing said auxiliary block notwtconstitutes the printing plate.

5 against the form to be reproduced; second, The foregoing specification signed at 1 providing a second block in the form of a Copenhagen, this 6th day of Feburary, 1914:.

fiong of unsized paper; third, coating said SIGVALD ALFRED CHRISTIAN KRISTENSEN. second block with a paste of metallic powder iln presence of and water-glass; fourth, pressing the coated CARL Fox MUILO,

10 side of the second block against the au-xili- JULIUS LEHMANN. 

